Gyrating flour-bolter.



No. 788,900. PATENTED MAY 2, 1905. J. F. HARRISON.

GYRATING FLOUR BOLTER.

APPLIGATIOK rum) HAY 14, 1904.

J HARRISON WITNESSES: INVENTOR A TTORNEY.

UNITED STATES Patented May 2, 1905.

PATENT OEEIcE.

JOHN F. HARRISON, OF MILIVA UKEE, WISCONSIN, ASSIGNOR TO ALLIS- CHALMERSCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

GYRATING FLOUR-BOLTER.

SPECIFICATION forming part of Letters Patent No. 788,900, dated May 2,1905.

Application filed May 14:, 1904- Serial No. 208,053.

To all whmn it may concern:

Be it known that I, JOHN F. HARRISON, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State of\Visconsin, have invented certain new and useful Improvements inGyrating Flour-Bolters, of which the following is a specification.

My invention relates to improvements in gyrating flour-bolters, and is afurther improvement on the device shown in my application, Serial No.188,977, filed January 14, 1904:.

It has been found in actual practice that the gyration of the bolter ismore smooth and even when the drive is attached to an eccentric-pinlocated at a distance from the center of the shaft and bolter equal toone-half of the desired throw. The driving can take place from eitherthe top or the bottom of the bolter, the suspension being near thecenter.

The invention is described in the following specification and shown onthe accompanying drawings, in which a Figure 1 is an elevation showingthe entire bolter partly in section and partly broken away. Fig. 2 is asimilar view of the lower portion of a bolter, illustrating the bottomdrive. Fig. 3 is a plan view of the cushioningspring, taken below line 33, Fig. 1. Fig. 4 is an enlarged inverted plan view of the eccentric-pinmounting, taken above line 3 3, Fig. 1.

Referring to Figs. 1 and 2, it will be seen that the eccentric'pin 1 isattached to the bottom of the shaft and carries a friction-roller 2,which barely bears against a coil-spring 3 when the bolter is in itsideal position. This coil-spring 2 is fastened at one end to an annularring 4, firmly bolted to the mill-floor. A similar eccentric-pin 7 ismounted upon the upper part of the bolter and in line witheccentric-pin 1. The friction-roller and pin pass through the opencenter of this coil-spring, for which any other spring devicemay besubstituted. The driving means (which,as shown, consists of a shafthaving a double universal joint and a driving-pulley, these parts beingrotatably mounted in a suitable framework) is applied to eithereccentric-pin. Consequently when power is applied the pin, together withall the attached parts, is rotated. The pin and its friction-roller willat first abut against the spring, throwing the bolter outward in thedirection of the weight until the critical speed has been reached, whenit will move in the opposite direction until the center lines of thepins and the driving-shaft coincide and the friction-roller is in thecenter of the spring device, freely rotating therein. The bolter willthus move smoothly and evenly, the universal joint being only for thepurpose of taking care of possible vibrations. As shown in Fig. i, theplate carrying the pin is movable in slots 5, so that the distance fromthe center of the shaft 6 can be changed at will, and, if desired, thethrow may thus be altered. The bottom drive is shown in a similar mannerin Fig. 2, and the cushioning device may be located either at the top orbottom.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a bolter, a sieve-box freely suspended for gyration,adriving-shaft, an eccentricallyweighted central shaft loosely mountedin the sieve-box,an eccentric-pin on the central shaft, and a flexibledriving connection between the eccentric-pin and the driving-shaft.

2. In a bolter, a sieve-box freely suspended for gyration, a shaftloosely mounted therein, an adjustable eccentric-pin on the shaft, adriving means, and a flexible driving connection between the pin and thedriving means.

3. In a bolter, a sieve-box freely suspended for gyration, aneccentrically-weighted shaft loosely mounted in the sieve-box, aneccentric-pin on the shaft, means for rotation applied to theeccentric-pin, and a cushioning device applied to the pin.

4. In combination, a bolter freely suspended for gyration, aneccentricallyweighted shaft loosely passing therethrough, an adjustableeccentric-pin mounted on the shaft, a cushioning device coacting withthe pin, a

flexible connection applied to the pin, and a 7. In a bolter, asieve-box, suspension-rods attached thereto for free gyration of thesieveboX, a rotatable shaft in the sieve-box, an eccentric-pin on theshaft, a Weight on the shaft in the radial plane through theeccentric-pin, and a driving means applied to the eccentricpm.

In testimony whereof I affix my signature in presence of two Witnesses.

JOHN F. HARRISON.

W'itnesses:

G. M. HUBBARD, FRED SUTER.

